Show "remaining estimated hours" in the Roadmap

Description

I extended the Roadmap screen to display the "remaining estimated hours" per milestone on side of the existing 'estimated hours' and 'total hours'.

The "remaining estimated hours" is the sum of all (estimated times - total time) for each non-closed tickets in a milestone.

Example: imagine that we have a milestone with a total estimated of 20h, and we have worked for 4h so far; then the remaining estimated time is 16h. Now we close a ticket of that milestone that was previously estimated to 2h in only 1h, then the remaining estimated time should drop to 14h (and not to 15h since that ticket that was estimated to 2h has been closed even if we only put 1h of work in it).

Here is a patch over r20999 implements that new feature, feel free to include it into TracHours under same licence as TracHours.

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